The heat sink is a device for heat dissipation of electronic components in electrical appliances. It is made of aluminum alloy, brass or bronze plate, sheet, sheet, etc., such as computer CPU central processor to use a considerable Of the heat sink, the TV in the power pipe, tube, amplifier in the amplifier tube to use the heat sink. General heat sink in use in the electronic components and heat sink surface coated with a layer of thermal grease, so that the heat generated by the components more effectively transmitted to the heat sink, and then distributed to the surrounding air through the heat sink.
On the heat sink material, the thermal conductivity of each material is different, according to the thermal conductivity from high to low arrangement, respectively, silver, copper, aluminum, steel. But if the silver for the heat sink will be too expensive, so the best program for the use of copper. Although aluminum is much cheaper, but obviously the thermal conductivity is not as good as copper (about only about 50% of copper).
The commonly used heat sink material is copper and aluminum alloy, both of which have their advantages and disadvantages. Copper thermal conductivity is good, but the price is more expensive, processing more difficult, the weight is too large (many copper radiators are more than the CPU weight limit), heat capacity is small, and easy to oxidation. And pure aluminum is too soft, can not be used directly, are the use of aluminum alloy to provide sufficient hardness, the advantages of aluminum alloy is cheap, light weight, but the thermal conductivity is much worse than the copper. Some radiators take their own long, in the aluminum radiator base embedded in a copper plate. For the average user, with aluminum heat sink has been enough to meet the cooling needs.